docs: def _credentials_found_in_envars():
          """Check for credentials in envars.
  
          Returns:
              bool: ``True`` if at least one is found, otherwise ``False``.
  
          """
          return any([os.getenv('PAN_ACCESS_TOKEN'),
                      os.getenv('PAN_CLIENT_ID'),
                      os.getenv('PAN_CLIENT_SECRET'),
                      os.getenv('PAN_REFRESH_TOKEN')])